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CONTACTLESS COMMUNICATION CIRCUIT AND PORTABLE TERMINAL

  • US 20080012712A1
  • Filed: 07/06/2007
  • Published: 01/17/2008
  • Est. Priority Date: 07/14/2006
  • Status: Active Grant
First Claim
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1. A contactless communication circuit having both a contactless communication card function and a contactless communication reader/writer function, comprising:

  • a capacitor section that forms a parallel-resonant circuit with a contactless communication antenna; and

    a capacitance switching section that makes a capacitance of the capacitor section effective in a mode of the contactless communication card function, and reduces the capacitance of the capacitor section in a mode of the contactless communication reader/writer function.

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